I wouldn't worry a wink about a neighbor's kids having similar names! They could move, you could move, etc. If it isn't family or even a best friend, I wouldn't worry....

I like Alice. I do really love Saoirse even more but the problem I have with it is that unless your a name junkie or Irish you would have NO clue how to pronounce it by just looking at it. It looks like "say-ores". I do love the way it sounds once pronounced though, I just have to point out the reality of mispronunciations.

My husband and I are expecting our third child, a girl, in early June. We are already parents to two boys, HenryOliver and GeorgeParker. We were all set on naming our daughter AliceHelena, but a few weeks ago new neighbors moved into our building and guess what their daughters' names are? Alice and Helen. What are the odds? So I started to rethink our daughter's name. What do you all think? AliceHelena or SaoirseHelena?

Keep your original idea! They will not be your neighbors forever, and your favorite original name will be yours forever.

Also, how often are you planning on calling her both Alice and Helena? Rarely, if ever?

Worst comes to worse there will be 2 little Alices playing in the yard who happen to share the same first name.
Best case scenario: Big Alice will take greatly to LittleAlice (because of their special connection) and they will become a great duo!